已知x=8,y=0.125,求代数式(x³+y³)²-(x³-y³)&
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已知x=8,y=0.125,求代数式(x³+y³)²-(x³-y³)²的值
![已知x=8,y=0.125,求代数式(x³+y³)²-(x³-y³)&](/uploads/image/z/3918405-21-5.jpg?t=%E5%B7%B2%E7%9F%A5x%3D8%2Cy%3D0.125%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%88x%26%23179%3B%2By%26%23179%3B%EF%BC%89%26%23178%3B-%EF%BC%88x%26%23179%3B-y%26%23179%3B%EF%BC%89%26)
(x³+y³)²-(x³-y³)²
=(x³+y³-x³+y³)(x³+y³+x³-y³)
=4x³y³
=4*(8*0.125)³
=4
=(x³+y³-x³+y³)(x³+y³+x³-y³)
=4x³y³
=4*(8*0.125)³
=4
已知x=8,y=0.125,求代数式(x³+y³)²-(x³-y³)&
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